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Vulvar melanoma is a very rare tumor with the rate of 0.1-0.19/100000. It mostly occurs during post menopausal period. In this case report, our patient was a 43 years old woman, her symptom was a small pruritic lesion noticed two months earlier when she was referred to the clinic. This lesion was a 5mm diameter dark brown and flat on her left labialis minor. Malignant melanoma with 3-5mm thickness was diagnosted following biopsy. Wide local excision with more than 2cm free margin and inguino femoral lymphadenectomy at the site of the lesion was done. The recurrence of tumor was not abserved during four months follow-up.